Wiktionary
gangs up
vb. (en-third-person singulargang up)
Usage examples of "gangs up".
Lisa, the gangs up there are currently engaged in what amounts to full-scale warfare, and unless somebody can show them a peaceful way to settle their differences, a lot of innocent people are going to suffer.
Your classic Mafia-style murder, except that the gangs up here in the Eight-Eight were all either black or Hispanic.
Fancily dressed children of all sizes played tag among the adults, hiding behind the potted palms which had been stationed through the ground floor, or rushed in gangs up and down the stairway shrieking –.
Eventually the rest of the world gangs up on you in sheer self defence.